~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2005 Canonical Ltd

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

"""Transport for the local filesystem.

This is a fairly thin wrapper on regular file IO."""

import os

import shutil

from stat import ST_MODE, S_ISDIR, ST_SIZE

import tempfile

import urllib

from bzrlib.trace import mutter

from bzrlib.transport import Transport

from bzrlib.osutils import abspath, realpath, normpath, pathjoin, rename

class LocalTransport(Transport):

    """This is the transport agent for local filesystem access."""

    def __init__(self, base):

        """Set the base path where files will be stored."""

        if base.startswith('file://'):

            base = base[7:]

        # realpath is incompatible with symlinks. When we traverse

        # up we might be able to normpath stuff. RBC 20051003

        super(LocalTransport, self).__init__(normpath(abspath(base)))

    def should_cache(self):

        return False

    def clone(self, offset=None):

        """Return a new LocalTransport with root at self.base + offset

        Because the local filesystem does not require a connection, 

        we can just return a new object.

        """

        if offset is None:

            return LocalTransport(self.base)

        else:

            return LocalTransport(self.abspath(offset))

    def abspath(self, relpath):

        """Return the full url to the given relative URL.

        This can be supplied with a string or a list

        """

        assert isinstance(relpath, basestring), (type(relpath), relpath)

        return pathjoin(self.base, urllib.unquote(relpath))

    def relpath(self, abspath):

        """Return the local path portion from a given absolute path.

        """

        from bzrlib.osutils import relpath

        if abspath is None:

            abspath = u'.'

        return relpath(self.base, abspath)

    def has(self, relpath):

        return os.access(self.abspath(relpath), os.F_OK)

    def get(self, relpath):

        """Get the file at the given relative path.

        :param relpath: The relative path to the file

        """

        try:

            path = self.abspath(relpath)

            return open(path, 'rb')

        except (IOError, OSError),e:

            self._translate_error(e, path)

    def put(self, relpath, f, mode=None):

        """Copy the file-like or string object into the location.

        :param relpath: Location to put the contents, relative to base.

        :param f:       File-like or string object.

        """

        from bzrlib.atomicfile import AtomicFile

        path = relpath

        try:

            path = self.abspath(relpath)

            fp = AtomicFile(path, 'wb', new_mode=mode)

        except (IOError, OSError),e:

            self._translate_error(e, path)

        try:

            self._pump(f, fp)

            fp.commit()

        finally:

            fp.close()

    def iter_files_recursive(self):

        """Iter the relative paths of files in the transports sub-tree."""

        queue = list(self.list_dir(u'.'))

        while queue:

            relpath = urllib.quote(queue.pop(0))

            st = self.stat(relpath)

            if S_ISDIR(st[ST_MODE]):

                for i, basename in enumerate(self.list_dir(relpath)):

                    queue.insert(i, relpath+'/'+basename)

            else:

                yield relpath

    def mkdir(self, relpath, mode=None):

        """Create a directory at the given path."""

        path = relpath

        try:

            path = self.abspath(relpath)

            os.mkdir(path)

            if mode is not None:

                os.chmod(path, mode)

        except (IOError, OSError),e:

            self._translate_error(e, path)

    def append(self, relpath, f):

        """Append the text in the file-like object into the final

        location.

        """

        fp = open(self.abspath(relpath), 'ab')

        self._pump(f, fp)

    def copy(self, rel_from, rel_to):

        """Copy the item at rel_from to the location at rel_to"""

        import shutil

        path_from = self.abspath(rel_from)

        path_to = self.abspath(rel_to)

        try:

            shutil.copy(path_from, path_to)

        except (IOError, OSError),e:

            # TODO: What about path_to?

            self._translate_error(e, path_from)

    def move(self, rel_from, rel_to):

        """Move the item at rel_from to the location at rel_to"""

        path_from = self.abspath(rel_from)

        path_to = self.abspath(rel_to)

        try:

            rename(path_from, path_to)

        except (IOError, OSError),e:

            # TODO: What about path_to?

            self._translate_error(e, path_from)

    def delete(self, relpath):

        """Delete the item at relpath"""

        path = relpath

        try:

            path = self.abspath(relpath)

            os.remove(path)

        except (IOError, OSError),e:

            # TODO: What about path_to?

            self._translate_error(e, path)

    def copy_to(self, relpaths, other, mode=None, pb=None):

        """Copy a set of entries from self into another Transport.

        :param relpaths: A list/generator of entries to be copied.

        """

        if isinstance(other, LocalTransport):

            # Both from & to are on the local filesystem

            # Unfortunately, I can't think of anything faster than just

            # copying them across, one by one :(

            import shutil

            total = self._get_total(relpaths)

            count = 0

            for path in relpaths:

                self._update_pb(pb, 'copy-to', count, total)

                try:

                    mypath = self.abspath(path)

                    otherpath = other.abspath(path)

                    shutil.copy(mypath, otherpath)

                    if mode is not None:

                        os.chmod(otherpath, mode)

                except (IOError, OSError),e:

                    self._translate_error(e, path)

                count += 1

            return count

        else:

            return super(LocalTransport, self).copy_to(relpaths, other, mode=mode, pb=pb)

    def listable(self):

        """See Transport.listable."""

        return True

    def list_dir(self, relpath):

        """Return a list of all files at the given location.

        WARNING: many transports do not support this, so trying avoid using

        it if at all possible.

        """

        path = relpath

        try:

            path = self.abspath(relpath)

            return os.listdir(path)

        except (IOError, OSError),e:

            self._translate_error(e, path)

    def stat(self, relpath):

        """Return the stat information for a file.

        """

        path = relpath

        try:

            path = self.abspath(relpath)

            return os.stat(path)

        except (IOError, OSError),e:

            self._translate_error(e, path)

    def lock_read(self, relpath):

        """Lock the given file for shared (read) access.

        :return: A lock object, which should be passed to Transport.unlock()

        """

        from bzrlib.lock import ReadLock

        return ReadLock(self.abspath(relpath))

    def lock_write(self, relpath):

        """Lock the given file for exclusive (write) access.

        WARNING: many transports do not support this, so trying avoid using it

        :return: A lock object, which should be passed to Transport.unlock()

        """

        from bzrlib.lock import WriteLock

        return WriteLock(self.abspath(relpath))

class ScratchTransport(LocalTransport):

    """A transport that works in a temporary dir and cleans up after itself.

    The dir only exists for the lifetime of the Python object.

    Obviously you should not put anything precious in it.

    """

    def __init__(self, base=None):

        if base is None:

            base = tempfile.mkdtemp()

        super(ScratchTransport, self).__init__(base)

    def __del__(self):

        shutil.rmtree(self.base, ignore_errors=True)

        mutter("%r destroyed" % self)